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Mutual capacitance measurement in a multi-touch input device

A capacitive measurement and multi-touch technology, applied in the input/output process of data processing, electronic switches, electrical components, etc., can solve the problems of low familiarity and long development time

Inactive Publication Date: 2012-11-14
NEODRON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are not as mature as those employed for single-touch sensor systems, resulting in less familiarity and longer development times for those who want to create multi-touch sensors

Method used

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  • Mutual capacitance measurement in a multi-touch input device
  • Mutual capacitance measurement in a multi-touch input device
  • Mutual capacitance measurement in a multi-touch input device

Examples

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Embodiment Construction

[0044] By referring below Figures 1 to 17 To best understand the preferred embodiment and its advantages over the prior art, where like numerals are used to indicate like and corresponding parts.

[0045] In an X-Y grid touch sensor, mutual capacitance refers to the capacitive coupling between the X-axis electrodes and the Y-axis electrodes. Electrodes on one layer of the touch screen can act as receivers and electrodes on another layer can act as transmitters. Driven signals on the transmitter electrodes can alter capacitive measurements made on the receiver electrodes because the two electrodes are coupled via mutual capacitance. In this way, mutual capacitance measurements may not suffer from the ambiguity problems associated with self capacitance, since mutual capacitance can effectively address every X-Y intersection (node) on the touch sensor.

[0046] One embodiment of the invention utilizes a relaxation oscillator to measure the mutual capacitance of the nodes of th...

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Abstract

Systems and methods for determining multiple touch events in a multi- touch sensor system are provided. The system may include a capacitance measurement unit (600), a pulse drive unit (1012), and a touch sensor having a plurality of nodes (200) and a plurality of electrodes (1014,1016) comprising at least two sets of electrodes. The method may include connecting a first electrode (1016) in a first set to the capacitance measurement unit (600), the pulse drive unit (1012) driving a voltage or current pulse onto a second electrode (1014) in a second set of electrodes. The method may further include the capacitance measurement unit measuring the mutual capacitance (Cm) at a node corresponding to the first and second electrodes. The method may include comparing the measured mutual capacitance at the node with a previously measured mutual capacitance for the node, and reporting that the node has been touched if there has been a deviation from the previously measured mutual capacitance.

Description

[0001] Related Application Cross Reference [0002] This application claims the benefit of U.S. Provisional Application No. 61 / 330,229, filed April 30, 2010, entitled "MUTUAL CAPACITANCE MEASUREMENT IN A MULTI-TOUCH INPUTDEVICE" , said provisional application is incorporated herein by reference in its entirety. technical field [0003] The present disclosure relates to capacitive touch sensor systems, and more particularly, to an improved method of performing mutual capacitance measurements to unambiguously detect one or more items in contact with a surface of a touch sensor. Background technique [0004] Capacitive touch sensors are used as user interfaces for electronic devices such as computers, mobile phones, personal portable media players, calculators, telephones, cash registers, gasoline pumps, and the like. In some applications, opaque touch sensors provide soft key functionality. In other applications, transparent touch sensors overlay the display to allow users ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044G06F3/041
CPCG06F2203/04104G06F3/0416G06F3/044H03K17/962G06F3/0446
Inventor 杰里·哈诺尔托德·奥康纳
Owner NEODRON LTD
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